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