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