One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,13,12)(11,14,16,15)(17,18)(19,27)(20,30)(21,29)(22,28)(23,24)(25,26)(31,32)(1,3)(2,5)(4,8)(6,7)(9,11,13,16)(10,14,12,15)(17,19,22,23)(18,24,28,27)(20,26,31,29)(21,32,25,30)(9,10,13,12)(11,15,16,14)(17,20,23,26,22,31,19,29)(18,25,27,30,28,21,24,32)(2,6)(5,7)(17,21)(18,26)(19,30)(20,24)(22,25)(23,32)(27,31)(28,29) involution — undirected(3,8)(5,7)(9,12,13,10)(11,14,16,15)(17,19,22,23)(18,27,28,24)(20,29,31,26)(21,32,25,30)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.