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