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