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