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