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