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