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This seems to be a bug in pdf exports. It has been reported as ticket http://trac.sagemath.org/ticket/15116.

As a temporary fix, you can

\begin{sageblock}
  from sage.graphs.graph_coloring import edge_coloring
  g = graphs.CompleteGraph(10)  
  p = g.graphplot(edge_colors=edge_coloring(g, hex_colors=True)).plot()
  p.save('graph.eps')
\end{sageblock}

\includegraphics{graph.eps}

Note that LaTeX will complain it cannot find graph.eps on first compilation, just ignore the error.