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