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