Question: Can we draw curved edges in the graph theory package?

 Recently I often drew some graphs in Graph Theory  by Maple. I tried to use DrawGraph, but  I found that evey edge only meets straight line  style in this package.

For example: 

restart:
with(GraphTheory):
with(SpecialGraphs):
a:=CycleGraph(8):
DrawGraph(a)

 

How do I draw some edges with curve syle in graph? like following:

 

 

 

Thanks!

 

 

 

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