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)(13,14,16,18)(15,17,19,20)(21,22,27,32)(23,29,34,35)(24,28,33,36)(25,31,26,30)(6,9)(10,12)(13,15)(14,17)(16,19)(18,20)(21,23,25,24,27,34,26,33)(22,28,30,29,32,36,31,35)(2,4)(15,19)(17,20) involution — undirected(5,7,8,11)(6,10,9,12)(21,24,25,34,27,33,26,23)(22,29,30,36,32,35,31,28)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.