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