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