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