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