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)(11,15)(12,16)(13,14)(17,18,21,23,22,26,20,25)(19,24,29,30,27,31,28,32)(2,5)(6,7)(9,11,15,10,13,16,12,14)(18,23)(20,21)(24,30)(25,26)(28,29)(31,32)(1,3,4,8)(2,6,5,7)(10,14)(11,16)(17,19)(18,24)(20,28)(21,29)(22,27)(23,30)(25,32)(26,31)(19,27)(24,31)(28,29)(30,32) 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.