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