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