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