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