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