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)(21,22,25,26)(23,27,31,29)(24,28,33,34)(30,32,35,36)(5,7,9,15)(6,10,12,13)(8,14,17,20)(11,18,16,19)(21,23,25,31)(22,27,26,29)(24,32,33,36)(28,35,34,30)(2,4)(22,26)(23,29)(27,31)(28,34)(30,36)(32,35) involution — undirected(5,8,9,17)(6,11,12,16)(7,14,15,20)(10,18,13,19)(24,33)(28,34)(30,35)(32,36)(7,15)(10,13)(14,20)(18,19)(21,24,25,33)(22,28,26,34)(23,30,31,35)(27,32,29,36)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.