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