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