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