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