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