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