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