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