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)(11,13)(12,14)(15,16) involution — undirected(1,3,5,4)(2,6,8,7)(9,11)(10,13)(12,15)(14,16)(17,18)(19,26)(20,24)(21,30)(22,25)(23,28)(27,31)(29,32)(1,3,5,4)(2,7,8,6)(10,14)(11,15)(17,18)(19,27)(20,30)(21,24)(22,25)(23,29)(26,31)(28,32)(10,14)(13,16)(17,19,21,28,22,29,20,31)(18,23,24,26,25,27,30,32)(1,4,5,3)(2,7,8,6)(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.