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