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