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