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