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