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