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