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