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