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