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