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