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)(17,18,23,24)(19,28,29,25)(20,32,26,21)(22,27,30,31)(2,5)(6,8)(11,13)(12,15)(18,24)(19,29)(20,26)(27,31) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11,14,13)(10,12,16,15)(17,19)(18,25)(20,30)(21,31)(22,26)(23,29)(24,28)(27,32)(9,12,14,15)(10,11,16,13)(17,20,23,26)(18,21,24,32)(19,30,29,22)(25,31,28,27)(1,2)(3,6)(4,5)(7,8)(9,13,14,11)(10,15,16,12)(17,21)(18,26)(19,31)(20,24)(22,25)(23,32)(27,29)(28,30)(1,3)(2,6)(4,7)(5,8)(9,10)(11,12)(13,15)(14,16)(17,22,23,30)(18,27,24,31)(19,26,29,20)(21,25,32,28)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.