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