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