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You can relabel the graph with the relabel method:

sage: D.relabel(['A','B','C','D'])

check

sage: D.relabel?

for more options.

Regarding coloring the vertices, you can do

sage: D.show(vertex_colors={'blue':[0,2],'green':[1],'black':[3]})

see

sage: D.plot?

for more plotting options. There might be one somewhere, but i do not see an edge-thickness option either.

You can relabel the graph with the relabel method:

sage: D.relabel(['A','B','C','D'])

check

sage: D.relabel?

for more options.

Regarding coloring the vertices, you can do

sage: D.show(vertex_colors={'blue':[0,2],'green':[1],'black':[3]})

see

sage: D.plot?

for more plotting options. options.

There might be one somewhere, but i do not see an edge-thickness option either.either in the documentation. However, looking into the source code of the GraphPlot class:

sage: from sage.graphs.graph_plot import GraphPlot
sage: GraphPlot??

sage: D.show(edge_thickness=4)