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