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