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