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