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