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