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