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