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