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