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