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