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