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