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