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)(21,22,26,30)(23,31,33,36)(24,29,25,28)(27,34,35,32)(1,2,3,4)(5,7,9,8)(6,10,11,12)(13,15)(14,17)(16,19)(18,20)(21,23,25,32,26,33,24,34)(22,27,29,31,30,35,28,36)(5,8,9,7)(6,10,11,12)(15,19)(17,20)(21,24,26,25)(22,28,30,29)(23,32,33,34)(27,31,35,36)(2,4)(21,23,26,33)(22,27,30,35)(24,32,25,34)(28,31,29,36)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.