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