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