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