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