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