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