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