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