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