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