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