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