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)(21,22,26,30)(23,27,31,34)(24,28,33,36)(25,29,32,35)(5,7,9,15)(6,10,12,13)(8,14,17,20)(11,18,16,19)(23,24)(25,32)(27,28)(29,35)(31,33)(34,36)(2,4)(21,23)(22,27)(24,32)(25,33)(26,31)(28,35)(29,36)(30,34) involution — undirected(5,8,9,17)(6,11,12,16)(7,14,15,20)(10,18,13,19)(23,31)(24,33)(27,34)(28,36)(7,15)(10,13)(14,20)(18,19)(21,24,26,33)(22,28,30,36)(23,32,31,25)(27,35,34,29)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.