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