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