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