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