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)(19,20,22,28)(21,24,31,32)(26,27,29,30)(2,6)(4,7)(9,10)(11,15)(12,14)(13,16)(17,19,23,22)(18,20,25,28)(21,29,31,26)(24,30,32,27)(1,3)(2,7)(4,6)(5,8)(9,11)(10,13)(12,16)(14,15)(17,20,22,25,23,28,19,18)(21,30,29,24,31,27,26,32)(2,6)(3,8)(11,16)(13,15)(17,21)(18,24)(19,26)(20,27)(22,29)(23,31)(25,32)(28,30) involution — undirected(1,4,5,7)(2,3,6,8)(10,14)(13,15)(21,31)(24,32)(26,29)(27,30)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.