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