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