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