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