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