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