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