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