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