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