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