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