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