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