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