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