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