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