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