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