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