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