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