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