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