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