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