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