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