One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,7)(6,8)(9,10)(11,15)(12,14)(13,16)(17,18)(19,24)(20,23)(21,30)(22,25)(26,31)(27,29)(28,32) involution — undirected(1,3)(2,6)(4,7)(5,8)(17,19,23,29)(18,24,20,27)(21,28,22,26)(25,31,30,32)(9,11,12,16)(10,13,14,15)(19,26)(21,22)(24,31)(25,30)(27,32)(28,29)(2,7)(3,8)(10,14)(13,15)(17,20,23,18)(19,27,29,24)(21,25,22,30)(26,32,28,31)(1,4,5,6)(2,3,7,8)(17,21,23,22)(18,25,20,30)(19,28,29,26)(24,31,27,32)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.