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