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