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