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