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