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