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