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