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