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