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