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