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