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