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