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)(17,18,23,28)(19,24,20,30)(21,26,22,27)(25,29,32,31)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,23)(21,31)(22,29)(25,26)(27,32)(28,30) involution — undirected(11,15)(13,16)(17,20,23,19)(18,25,28,32)(21,31,22,29)(24,27,30,26)(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,21,23,22)(18,26,28,27)(19,29,20,31)(24,32,30,25)(10,14)(13,16)(17,21,23,22)(18,27,28,26)(19,29,20,31)(24,25,30,32)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.