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