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