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