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