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