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)(13,14,18,17)(15,20,16,19)(21,22)(23,24)(25,26)(27,28)(5,7,10,8)(6,11,12,9)(13,14,18,17)(15,19,16,20)(22,26)(23,28)(13,15,18,16)(14,19,17,20)(21,23,25,28)(22,27,26,24)(1,2)(3,4)(5,8,10,7)(6,9,12,11)(13,16,18,15)(14,20,17,19)(21,24)(22,23)(25,27)(26,28)(5,9)(6,8)(7,12)(10,11)(13,17,18,14)(15,20,16,19)(21,22)(23,27)(24,28)(25,26)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.