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