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