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