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