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