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