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