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