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