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)(13,14,19,23)(15,24,26,18)(16,27,25,21)(17,28,20,22)(5,7,10,6)(8,12,9,11)(13,15)(14,18)(16,20)(17,25)(19,26)(21,22)(23,24)(27,28)(2,4)(13,16,17,26,19,25,20,15)(14,21,28,24,23,27,22,18)(5,8,10,9)(6,11,7,12)(13,17,19,20)(14,22,23,28)(15,25,26,16)(18,21,24,27)(5,9,10,8)(6,11,7,12)(13,18,20,27,19,24,17,21)(14,15,22,25,23,26,28,16)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.