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