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