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