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