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