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