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