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)(23,30,34,32)(24,31,29,25)(27,35,36,33)(5,6)(7,10)(8,9)(11,12)(13,15,16,19)(14,17,18,20)(21,23,31,35,26,34,25,33)(22,27,24,32,28,36,29,30)(2,4)(6,9)(10,12)(21,24,25,22,26,29,31,28)(23,32,33,27,34,30,35,36)(5,7,8,11)(6,10,9,12)(14,18)(17,20)(22,28)(24,29)(27,36)(30,32)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.