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