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