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