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