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