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