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