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