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