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