One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10)(11,13)(12,14)(15,16)(17,18,21,25)(19,23,28,31)(20,29,22,24)(26,27,32,30)(1,3,5,2)(4,7,8,6)(9,11,12,15)(10,13,14,16)(17,19,21,28)(18,23,25,31)(20,27,22,30)(24,26,29,32)(1,4,5,8)(2,6,3,7)(10,14)(13,16)(17,18)(19,26)(20,24)(21,25)(22,29)(23,30)(27,31)(28,32)(2,3)(6,7)(10,14)(13,16)(17,18)(19,23)(20,29)(21,25)(22,24)(26,30)(27,32)(28,31) involution — undirected(17,20,21,22)(18,24,25,29)(19,27,28,30)(23,26,31,32)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.