sage: graphs.WheelGraph(3).is_isomorphic(graphs.CompleteGraph(3))
True
But  graphs.WheelGraph(3).show() 

<https://lh3.googleusercontent.com/-iKLcJ9btZ1I/WlbbWONcvtI/AAAAAAAAMvQ/92jJW86d-n0eQUCTaZoqDZpwnO3eV3vDgCLcBGAs/s1600/sage.png>
show(Graph(graphs.WheelGraph(3).edges())) is OK.
So I do not know why.

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