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