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