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)(8,17,14,11)(10,18,19,16)(21,22)(23,27)(24,29)(25,34)(26,30)(28,31)(32,36)(33,35)(5,7,14,18,9,15,8,16)(6,10,17,20,12,19,11,13)(21,23)(22,27)(24,33)(25,31)(26,32)(28,34)(29,35)(30,36)(7,15)(10,19)(13,20)(16,18)(21,23)(22,28)(24,31)(25,33)(26,32)(27,34)(29,36)(30,35) involution — undirected(2,4)(21,24,26,25)(22,29,30,34)(23,31,32,33)(27,28,36,35)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.