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