tex.sx-q-493460

\documentclass[tikz,border=9]{standalone}
\usetikzlibrary{arrows.meta,decorations.pathreplacing}
\begin{document}

\def\colorlist{"","red","orange","yellow","green","cyan","violet"}
\tikzset{
	spindle/.style={
		decorate,
		decoration={
			show path construction,
			lineto code={
				\clip[bend left=20]
					(\tikzinputsegmentfirst)to(\tikzinputsegmentlast)to cycle;
				\filldraw[bend left=2,
					line width=300/\pgfdecoratedinputsegmentlength]
					(\tikzinputsegmentfirst)to(\tikzinputsegmentlast)to cycle;
			}
		}
	}
}
\tikz{
	\foreach\A[count=\i]in{A,...,F}{
		\pgfmathsetmacro\ithcolor{{\colorlist}[\i]}
		\path(\i*60:6)node(vertex\i)
			[circle,draw,minimum size=2cm,line width=6pt]{};
		\fill[\ithcolor]
			(vertex\i)+(2pt,0)circle(1)
			(vertex\i)node[black,scale=3]{\sffamily\A};
	}
	\foreach\i in{1,...,5}{
		\pgfmathtruncatemacro\ii{\i+1}
		\foreach\j in{\ii,...,6}{
			\pgfmathsetmacro\ithcolor{{\colorlist}[\i]}
			\pgfmathsetmacro\jthcolor{{\colorlist}[\j]}
			\draw[preaction={spindle},line width=1.5,
				{Stealth[fill=\jthcolor,length=20pt]}%
				-{Stealth[fill=\ithcolor,length=20pt]}]
				(vertex\i)--(vertex\j);
		}
	}
}

\end{document}