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