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