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)(16,19)(20,24)(21,25)(23,26)(27,28)(5,7,11,9)(6,12,10,8)(13,14,19,24,17,20,16,18)(15,21,26,28,22,27,23,25)(1,2,3,4)(5,8,11,12)(6,7,10,9)(14,20)(15,22)(18,24)(23,26)(5,9,11,7)(6,12,10,8)(13,15,17,22)(14,21,20,27)(16,23,19,26)(18,25,24,28)(5,10,11,6)(7,8,9,12)(15,22)(21,27)(23,26)(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.