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