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