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