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