One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10,12,14)(11,15,16,13)(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,18)(19,23)(20,25)(21,30)(22,26)(24,27)(28,32)(29,31)(10,14)(11,16)(17,19)(18,23)(20,29)(21,27)(22,28)(24,30)(25,31)(26,32) involution — undirected(1,4,5,3)(2,6,7,8)(10,14)(13,15)(17,19)(18,24)(20,27)(21,29)(22,28)(23,30)(25,32)(26,31)(2,7)(6,8)(10,14)(13,15)(17,20,22,21)(18,25,26,30)(19,27,28,29)(23,24,32,31)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.