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