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