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