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