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