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