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