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