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