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