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