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