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