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