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