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