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