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