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