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