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