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