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