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