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