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