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