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