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