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