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