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