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