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