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