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