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