\documentclass[border=10pt]{standalone}


         \usepackage{tikz}
         \usetikzlibrary{decorations.markings, shapes.geometric} 

        
\definecolor{vertexcol}{RGB}{250,250,250}\definecolor{col0}{RGB}{0,0,204}\definecolor{col1}{RGB}{204,0,0}\definecolor{col2}{RGB}{0,204,0}\definecolor{col3}{RGB}{255, 165, 0}\definecolor{col4}{RGB}{128,0,128}\definecolor{col5}{RGB}{255, 255, 0}\definecolor{col6}{RGB}{102, 0, 102}\definecolor{fontcolor}{RGB}{0,0,0}

        \begin{document}

        \tikzset{
            bicolor/.style n args={2}{
                postaction={draw=#1, decoration={curveto,  post=moveto, post length=0.5*\pgfmetadecoratedpathlength}, decorate},
                postaction={draw=#2, decoration={curveto,  pre=moveto, pre length=0.5*\pgfmetadecoratedpathlength}, decorate},
            },
            bicolor_neg/.style n args={2}{
                postaction={draw=#1, decoration={curveto,  pre=moveto, pre length=0.5*\pgfmetadecoratedpathlength}, decorate},
                postaction={draw=#2, decoration={curveto,  post=moveto, post length=0.5*\pgfmetadecoratedpathlength}, decorate},
                postaction={decoration={markings, mark=at position 0.5 with {\node[diamond, fill=white, aspect=0.7,draw, thin, minimum width=10pt,opacity=1] {};}}, decorate},
            },
            vertex/.style={circle, draw=black, ultra thick ,fill=vertexcol!80,minimum size=15pt},
        }

        \begin{tikzpicture}

        
\node[vertex] (0) at (3.0,0.0) [circle] {\color{fontcolor}0};
\node[vertex] (1) at (1.8369701987210297e-16,3.0) [circle] {\color{fontcolor}1};
\node[vertex] (2) at (-3.0,3.6739403974420594e-16) [circle] {\color{fontcolor}2};
\node[vertex] (3) at (-5.51091059616309e-16,-3.0) [rectangle] {\color{fontcolor}3};
\path[line width=4.0,bicolor={col0}{col0}, bend right=-15.0, opacity=1.0] (0) to (1);
\path[line width=4.0,bicolor={col1}{col0}, bend right=0.0, opacity=1.0] (0) to (1);
\path[line width=4.0,bicolor={col1}{col1}, bend right=15.0, opacity=1.0] (0) to (1);
\path[line width=4.0,bicolor={col0}{col0}, bend right=-11.25, opacity=1.0] (0) to (2);
\path[line width=4.0,bicolor={col1}{col1}, bend right=11.25, opacity=1.0] (0) to (2);
\path[line width=4.0,bicolor={col1}{col0}, bend right=0.0, opacity=1.0] (0) to (3);
\path[line width=4.0,bicolor={col1}{col0}, bend right=-11.25, opacity=1.0] (1) to (2);
\path[line width=4.0,bicolor={col1}{col1}, bend right=11.25, opacity=1.0] (1) to (2);
\path[line width=4.0,bicolor={col1}{col0}, bend right=0.0, opacity=1.0] (1) to (3);
\path[line width=4.0,bicolor={col0}{col0}, bend right=-11.25, opacity=1.0] (2) to (3);
\path[line width=4.0,bicolor={col1}{col0}, bend right=11.25, opacity=1.0] (2) to (3);

        \end{tikzpicture}

        \end{document}
        
