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