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