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