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)(13,14,17,18)(15,20,19,16)(23,24)(27,28)(6,9)(10,11)(13,15)(14,16)(17,19)(18,20)(21,22,26,25)(23,28,24,27)(6,9)(10,11)(14,18)(15,19)(21,23,26,24)(22,27,25,28)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,14)(15,20)(16,19)(17,18)(21,24,26,23)(22,28,25,27)(5,7)(6,10)(8,12)(9,11)(13,16,17,20)(14,19,18,15)(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.