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