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