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