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