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