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