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