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