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