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