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