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