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