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