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