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