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