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)(13,14,16,21,17,19,18,22)(15,23,26,20,25,28,24,27)(1,2,4,3)(5,7,10,8)(6,11,9,12)(14,19)(20,27)(21,22)(23,28)(1,3,4,2)(5,6,10,9)(7,12,8,11)(13,15)(14,20)(16,24)(17,25)(18,26)(19,27)(21,23)(22,28)(5,8,10,7)(6,11,9,12)(13,16,17,18)(14,21,19,22)(15,24,25,26)(20,23,27,28)(5,9,10,6)(7,12,8,11)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.