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