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