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