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