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Two more points: First, I found the following site helpful for displaying graphs http://www.sagenb.org/home/pub/2351/

Second, graphviz is really great at displaying graphs with edge labels and many other decorations. Its a whole graph layout programming language, but it can't be included in sage because of a licensing issue apparently. The link above shows how to output a graph from sage to a dot file suitable for graphviz. For example, after downloading graphviz on your computer, you can run "dotty file.dot".