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