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