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