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