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