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