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