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