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