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