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