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