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