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