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