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