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