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