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