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