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