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