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