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