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