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