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