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