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