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)(23,28,31,35)(24,32,34,29)(26,30,33,36)(5,7)(6,10)(8,14)(9,15)(11,18)(12,13)(16,19)(17,20)(22,27)(23,24)(26,33)(28,29)(31,34)(32,35) involution — undirected(1,2,3,4)(21,23,26,24,25,31,33,34)(22,28,30,32,27,35,36,29)(5,8,9,17)(6,11,12,16)(7,14,15,20)(10,18,13,19)(22,27)(28,35)(29,32)(30,36)(7,15)(10,13)(14,20)(18,19)(21,24,33,23,25,34,26,31)(22,29,36,35,27,32,30,28)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.