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