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