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