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