\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{fullpage}

\usepackage{tkz-graph}
\usetikzlibrary{arrows}

\definecolor{dccalert}{RGB}{153,0,0}

\begin{document}
\pagestyle{empty}

\begin{figure}
  \begin{tikzpicture}[node distance = .05\linewidth]
    \Vertices*[Math]{circle}{a, b, c, d}
    \AddVertexColor{dccalert}{a, c, d}
    \SetUpEdge[style={post}]
    \Loop[color=dccalert, dist = .05\linewidth, dir = EA](a)
    \Loop[dist = .05\linewidth, dir = NO](b)
    \Loop[color=dccalert, dist = .05\linewidth, dir = WE](c)
    \Loop[color=dccalert, dist = .05\linewidth, dir = SO](d)
    \Edge[color=dccalert](a)(c)
    \Edge[color=dccalert](a)(d)
    \Edge(b)(d)
    \Edge[color=dccalert](c)(a)
    \Edge[color=dccalert](c)(d)
    \Edge[color=dccalert](d)(a)
    \Edge(d)(b)
    \Edge[color=dccalert](d)(c)
  \end{tikzpicture}
\end{figure}
\end{document}

%%% Local Variables: 
%%% mode: latex
%%% TeX-master: t
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