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