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