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