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