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