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