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