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