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