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