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