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