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