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