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)(22,24)(25,31)(26,29)(27,30)(28,32)(9,11)(10,13)(12,16)(14,15)(18,23)(19,25)(20,28)(22,26)(27,32)(30,31) involution — undirected(2,5)(6,8)(10,14)(11,16)(17,19,26,32,21,27,22,25)(18,20,29,28,23,30,24,31)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(18,23)(19,27)(24,29)(25,32)(17,20,22,31,21,30,26,28)(18,19,24,25,23,27,29,32)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.