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