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