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