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