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