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