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