save the layout using igraph

Hi R users,

I am using built-in functions in  igraph package to draw networks . I need
to compare several network with exactly the same structure but with edge
hightlighted differently.  I am wondering if there is a way to save the
layout so that every graph will look the same as each other except for the
colors of edges. Or is there any parameter I can set for this purpose??

Thanks in advance, 
Shukai

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