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