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