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)(15,24)(16,21)(17,22)(18,28)(19,23)(20,26)(25,27)(5,7)(6,9)(8,11)(10,12)(13,15,17,21,19,25,18,26)(14,20,28,27,23,16,22,24)(2,4)(7,11)(9,12)(13,16)(14,21)(15,22)(17,24)(18,27)(19,20)(23,26)(25,28) involution — undirected(5,7)(6,9)(8,11)(10,12)(13,17,19,18)(14,22,23,28)(15,21,25,26)(16,27,20,24)(7,11)(9,12)(15,25)(16,20)(21,26)(24,27) 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.