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)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,16,15)(17,18)(19,26)(20,24)(21,28)(22,31)(23,25)(27,30)(29,32)(9,11,13,12)(10,15,16,14)(17,19,23,29)(18,21,25,30)(20,28,22,27)(24,32,31,26)(2,6)(5,7)(17,20,23,22)(18,24,25,31)(19,27,29,28)(21,26,30,32)(3,8)(5,7)(9,12,13,11)(10,15,16,14)(17,21)(18,19)(20,26)(22,32)(23,30)(24,27)(25,29)(28,31)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.