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