One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,15)(14,16)(17,18,22,25)(19,26,28,32)(20,23,30,29)(21,27,31,24)(2,5)(3,7)(10,13)(11,15) involution — undirected(9,10,12,13)(11,14,15,16)(17,19,21,29,22,28,31,23)(18,20,24,26,25,30,27,32)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,20,22,30)(18,23,25,29)(19,27,28,24)(21,26,31,32)(9,11,12,15)(10,14,13,16)(19,28)(20,30)(23,29)(26,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.