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