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