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