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