One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,15)(8,12)(9,22)(10,14)(11,18)(13,16)(17,30)(19,31)(20,29)(21,28)(23,27)(24,35)(25,32)(26,33)(34,36) involution — undirected(5,7,16,32,10,19,9,18)(6,11,22,31,14,25,13,15)(8,17,20,33,21,34,23,35)(12,26,27,30,28,24,29,36)(5,8,16,20,10,21,9,23)(6,12,22,27,14,28,13,29)(7,17,32,33,19,34,18,35)(11,24,31,36,25,26,15,30)(1,2,3,4)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.