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