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