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