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