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