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