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