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