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