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