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