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