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