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