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