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