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)(21,22,25,24,26,28,33,32)(23,27,31,30,29,34,36,35)(5,7,9,15)(6,10,12,13)(8,16,17,14)(11,19,20,18)(21,23)(22,27)(24,30)(25,31)(26,29)(28,34)(32,35)(33,36)(2,4)(23,29)(27,34)(30,35)(31,36) involution — undirected(5,8,9,17)(6,11,12,20)(7,14,15,16)(10,18,13,19)(22,28)(24,32)(27,34)(30,35)(6,12)(10,13)(11,20)(18,19)(21,24,25,28,26,32,33,22)(23,30,31,34,29,35,36,27)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.