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