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