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