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