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