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