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