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