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