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