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