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