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