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