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