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