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