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