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