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