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)(13,14,18,16)(15,20,17,19)(21,22,25,28)(23,26,27,24)(5,7,10,8)(6,11,12,9)(13,15)(14,19)(16,20)(17,18)(21,23,25,27)(22,26,28,24)(5,7,10,8)(6,9,12,11)(13,14,18,16)(15,20,17,19)(21,24,25,26)(22,27,28,23)(1,2)(3,4)(5,8,10,7)(6,9,12,11)(13,16,18,14)(15,20,17,19)(5,9)(6,8)(7,12)(10,11)(13,17,18,15)(14,19,16,20)(21,22)(23,26)(24,27)(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.