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