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