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