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