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