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