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