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