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