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