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