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