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