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