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