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