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