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