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