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