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