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)(19,26)(20,23)(21,25)(22,27)(24,30)(28,32)(29,31)(10,14)(13,15)(17,19,21,28)(18,22,25,31)(20,29,30,27)(23,26,24,32)(1,4,6,5)(2,7,3,8)(10,14)(13,15)(1,5,6,4)(2,7,3,8)(11,16)(13,15)(18,23)(20,30)(22,26)(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.