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