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