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