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