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