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