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