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