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