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