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