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