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