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