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