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)(23,26)(24,27)(25,29)(28,32)(30,34)(31,33)(35,36)(5,6,8,10,9,12,16,18)(7,13,15,20,14,11,19,17)(21,23)(22,26)(24,31)(25,30)(27,33)(28,35)(29,34)(32,36)(5,7)(6,11)(8,15)(9,14)(10,17)(12,13)(16,19)(18,20)(22,27)(24,32)(26,33)(28,29)(31,36)(34,35) involution — undirected(1,3,4,2)(6,12)(7,14)(10,18)(15,19)(23,30)(26,34)(31,36)(33,35)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.