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