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