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