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