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