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