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)(13,14,19,23)(15,24,25,17)(16,20,27,28)(18,21,26,22)(5,7,10,8)(6,11,9,12)(13,15,18,16,19,25,26,27)(14,20,22,24,23,28,21,17)(2,4)(5,6,10,9)(7,12,8,11)(13,16,26,15,19,27,18,25)(14,17,21,28,23,24,22,20)(5,8,10,7)(6,11,9,12)(13,17)(14,15)(16,22)(18,20)(19,24)(21,27)(23,25)(26,28)(5,9,10,6)(7,12,8,11)(13,18,19,26)(14,21,23,22)(15,16,25,27)(17,28,24,20)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.