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