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