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