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