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