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