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