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