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