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