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