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