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