One vertex per element, one color per generator, with an edge from x to x·s.
(2,7)(3,4)(10,13)(11,12)(17,18)(19,23)(20,25)(21,26)(22,27)(24,29)(28,30)(31,32) involution — undirected(1,2)(3,8)(4,5)(6,7)(9,10,14,13)(11,16,12,15)(17,19,22,29)(18,23,27,24)(20,26,30,32)(21,28,31,25)(1,3,6,4)(2,8,7,5)(9,11,14,12)(10,15,13,16)(17,19)(18,24)(20,26)(21,28)(22,29)(23,27)(25,31)(30,32)(1,4,6,3)(2,8,7,5)(9,12,14,11)(10,16,13,15)(17,19)(18,23)(20,26)(21,25)(22,29)(24,27)(28,31)(30,32)(9,13,14,10)(11,16,12,15)(17,20,22,30)(18,25,27,28)(19,26,29,32)(21,24,31,23)(1,5,6,8)(2,4,7,3)(17,21)(18,26)(19,28)(20,24)(22,31)(23,30)(25,29)(27,32)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.