Dear Asma,

There is a question "Permutability Graph with GAP"
on Mathematics Q&A site, which you may find useful:

        http://math.stackexchange.com/q/1149728/

You may start with modifying the construction of the 
adjacency matrix for a different vertices set and 
different condition for the vertices to be connected. 

Hope this helps
Alexander


> On 11 Oct 2015, at 08:54, asma hamze <hamze2...@yahoo.com> wrote:
> 
> Dear forum,
> Can someone help with the construction a graph with program in GAP?A graph 
> fora group G, where its vertices set is G and two element x,y of G are 
> connectedif o(x)|o(y) or o(y)|o(x). Also, what is the automorphism group of 
> this graph? 
> With best regards.
> Asma.
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