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)(15,22,23,28)(16,21,18,26)(20,25,27,24)(1,2)(3,4)(5,7,8,12)(6,9,10,11)(14,19)(15,23)(21,26)(24,25)(2,4)(13,15,18,24,17,23,16,25)(14,20,21,22,19,27,26,28)(1,2)(3,4)(13,16,17,18)(14,21,19,26)(15,24,23,25)(20,28,27,22)(2,4)(15,23)(20,27)(22,28)(24,25) 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.