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