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