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