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