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