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