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