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