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