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