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