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