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