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