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