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