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