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