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