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