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