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