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