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