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