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