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