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