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)(11,15,16,14)(1,3,4,7)(2,5,6,8)(9,10)(11,14)(12,13)(15,16)(17,18)(19,26)(20,22)(21,25)(23,27)(24,29)(28,32)(30,31)(2,6)(5,8)(10,13)(14,15)(18,22)(20,29)(23,26)(24,25)(27,30)(31,32) involution — undirected(9,11,12,16)(10,14,13,15)(17,19,21,28)(18,23,25,31)(20,30,29,27)(22,26,24,32)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.