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