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