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