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