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