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