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