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