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