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