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