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