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