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