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