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