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