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