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