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