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