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