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