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