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