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