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