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