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