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