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