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