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