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