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