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