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