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