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