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