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