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