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