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