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