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