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