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