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)(23,30)(24,27)(25,29)(26,31)(28,34)(32,36)(33,35) involution — undirected(1,2)(3,4)(5,6,9,11)(7,14,15,20)(8,17,16,10)(12,19,18,13)(2,4)(6,11)(7,15)(10,17)(13,19)(21,23,25,32)(22,26,29,35)(24,33,34,31)(27,30,28,36)(5,7,16,19,9,15,8,13)(6,12,17,20,11,18,10,14)(22,27)(24,34)(26,30)(28,29)(31,33)(35,36)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.