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