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