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