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