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