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