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