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