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