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