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