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