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