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