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