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