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)(11,13)(12,14)(15,16)(17,18,22,25)(19,24,29,26)(20,21,31,23)(27,30,32,28)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,19,22,29)(18,24,25,26)(20,27,31,32)(21,30,23,28)(10,14)(13,16)(17,20)(18,23)(19,26)(21,25)(22,31)(24,29)(27,28)(30,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,20)(18,21)(19,27)(22,31)(23,25)(24,30)(26,28)(29,32)(17,21,22,23)(18,20,25,31)(19,28,29,30)(24,32,26,27)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.