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