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