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